Unhangout is a platform for holding large-scale, virtual, participant-driven, community-based events online, developed at the MIT Media Lab and built using open-source components. Billed as a tool for online community gatherings rather than online lectures, an Unhangout event consists of a landing page chat room, called the lobby and an infinite number of breakout rooms. Participants can see who else is in the lobby and converse using the built-in chat tool. Event hosts can stream introductory videos into the lobby and invite participants to join breakout rooms. Breakout rooms are small group video chats. Unhangouts is free, easy to understand, and quick to set up.